Main.java

public class Main {
    public void foo() {
        System.out.println("Foo!");
    }

    public static void main(String[] args) {
        new Main().foo();
    }
}

main.m

#import <Foundation/Foundation.h>

@interface Person : NSObject
- (void)frob;
@end

@implementation Person
- (void)frob {
    NSLog(@"frob!");
}
@end

int
main() {
    @autoreleasepool {
        Person *brian = [[[Person alloc] init] autorelease];
        [brian frob];
    }
    return 0;
}
// vim: set syn=objc: